Boiler-chipping device



June 12; 1928.

F. DOCKSTADER BOILER CHIPPING DEVICE Filed July 20, 1925 2 Sheets-SheetI/Ifrr/ June 12. 1928.

- F. DOCKSTADER BOILER CHIPPING DEVICE 2 Sheets-Sheet 2 Filed July 20.1925 ooooooooa Patented June 12, 1928.

FOSTER DOCKSTADER, 0F FAMOSO, CALIFORNIA.

PATENT o FFICVTE'.

-BOILERCHIPIING DEVICE.

Application filed July 20, 1925. Serial No. 44,790.

This invention relates to boiler chipping devices, and is moreparticularly directed to a device for removing the incrustat-ions formedupon the interior of boilers'by the precipitation from the wateremployed therein of certain soluble materials which form a hard stone orcrusty material upon the inside of the surface of the boiler.

In boilers of light construction, in which water is heated or steamgenerated, the 'insoluble salts found in the water or formed thereinduring the boiling thereof, precipitate out in the form of a ,film orscale or crust upon the inner surface of the boiler. This incrustationis an effective heat insulating material and makes it difficult for heatto penetrate through the boiler shell to the water. This resistance toheat penetration to the water results in a considerable waste of theheat as the same is directed up the stack and consequently results in aloss of fuel.

Whenv this incrustation is formed upon the inner surface of the shell ofthe boiler, localized overheating results in many places along the shellof the boiler, particularly those points which are subject to directconvection and radiation of the heat which in many cases has resulted inthe burning out of the shell of the boiler and caused considerabledamage both to property and human life. The reason for this is that theincrustations prevent the water circulating within the boiler fromcarrying away the heat from the metal-shell and thus the metal becomesintensely heated and, due to the pressure withinthe boiler, fails. Thereare certain portions of theinterior of the boiler from which the removalof this incrustation is very diflicult, for example, that portion of theshell concealed by the small tubes that run lengthwise through mostboilers of the fire tube type. I

An object of this invention is toprovide a device for removing suchincrustations more easily and more economically than before, and whichis applicable to reach all portions of the boiler.

An object of'this invention is to produce a boiler chipping deviceoperated by pneumatic pressure to rapidly oscillate a chipping tool andin which means are provided for preventing or compensating for therebound of such a chipping tool.

Other objects and advantages of this indrawings,

vention will be apparent from the following detailed description of apreferred embodiment thereof, as illustrated in the accompanyingdrawings.

In the drawings:

Fig. 1 is a perspectiveview of aboiler chipping device embodying thisinvention.

Fig. 2 is an enlarged bottom plan view thereof showing the pneumaticcylinder partlyin section and the chipping tool operating rod and easingbroken away.

Fig. 3 is an enlarged. central side elevation of the boiler chippingdevice head embodied inlthis invention.

Fig. 4 is an end elevation taken substan tially on the line 44; of Fig.3.

Fig. 5 is a bottom plan view of one form chipping operation illustratingthe boiler chipping device as embodied in this invention in positionwithin a boiler and connected to a source of pneumatic pressure."

In the preferred embodiment of this invention illustrated in. theaccompanying 1 illustrates a pneumatic cylinder connected to aflexibleconduit 2 which conduit is connected to a source 3 of pneumaticpressure. The pneumatic cylinder .1 embodies a piston 4 having a pistonrod 5 and is of common commercial construction and no claim made to itsspecific construction or operation. v

The piston 4; oscillates rapidly within the pneumatic cylinder 1 underthe action of the fluid transmitted through the conduit 2 from thesource 3. A heavy steel head 6, in which a special chipping tool 7 ismovably held by a pin 8, is rigidly connected to thepneumatic cylinder 1bynieans of a heavy tube or pipe 9, as is illustrated at 10 and 1 1,respectively. The length and curvature of the tube or pipe 9 can be madeto .suit any vessel into which the entire device i-s to be inserted.mounted a piston rod 12 which piston rod 12 is the means fortransmitting the blows chipboiler chip l/Vithin the tube '9, is I of thepneumatically operated piston tto V the chipping tool 7. The end 13-ofthe pisu 5 to 8, inclusive.

ton 12 is engaged by the end of" the piston rod 5 and is rapidlyreciprocated by the reciprocation of the piston L to which therod 5 isconnected. The end 14 of the piston 12 extends through and isreciprocatczl" within the bore 15 of the head 6. The forward end of thepiston rod 12 strikes the shoulder 160i? thechipping tool 7 and causesthe same to rotateupon the pin 8. The

chipping tool 7 is recessed to form the shoul der16. The chipping tool 7is provided with a chipping cdge17 which may be of the diamond pointformas illustrated in Figs.

2 and 3, or of the formsillustrated in Figs. The diaimond point i.llus

" trated in Fi s. 2 and 3 would be es ieciall adaptable for use whereinthe incrustation formed with n theinterior of the boiler was very hardand brittle,

The end of the head 6 provided with a transversely extending portion 18the edge ,19 of which may be'engaged by the edge QOot the chipping tool7to provide a stop therefor to limit the rotation of the tool 7onthepin8. v e:

When the tool is in'operation, each impact of the chipping tool 7 isaccompanied with a corresponding rebound thereof which is transmittedback tothe piston12. Between v the hitting of the piston 4 'and ftherebound of the chipping tool '7, the piston 121'is caused to reciprocaterapidly within the tube 9. For this reason it is necessary'that the head6 be of heavy construction so that the rebound of the chipping tool 7will be transmitted to thepiston 12 as described, 1 and not to the head6, as a head 6 of light construction would oscillate up and down soviolently as to make th'e'same ditficult to manipulate." The pin 8 has ahead 21 which fits in a recess 22 formed in the heads6i The pin 8 passesthrough'a bore 23 formed in the head 6 and when'the chipping tool 7ismounted in position on the pin 8, the pin 8 is removably retained 1nposition by means of a fiat spring 2 1which' is pivotally mount- *is atits opposite end connected within the bore 29 formed in the head 6. Theforward end of the bore 29 is of reduced diameter ed on a screw 25 screwthreaded within the head 6 so that the spring 24 may be rotated toengage the head21and retain the pin 8 in position.

Means are provlded for cooling the pin 8 during the operation of thetool as the con-.

tinuous oscillation of the chipping tool 7 upon the pin 8 generatesconsiderable heat. The exhaust air from the pneumatic cylinder 1 isemployed for this purpose and is admitted into a cylinder 26 secured tothe pneumatic cylinder l byany suitable means,

such as claj1np'27, and to which cylinder 26 a conduit or pipe28 issecured. The pipe 28 V of boilers." The chipping tools 7, 7 and asillustrated at 30 and is so positioned as to direct this exhaust airdirectly against the pin 8. i

. In order to permit easy manipulation of this pneumatic chipping devicewithin a boiler, tongs 31 are provided which are adapted to be-fittedwithin bores 32 formed in the head 6 as is illustrated in Figs. 1 and 9.

vIt will be obvious from the foregoing that I have provided a boilerchipping device" which is of heavy construction, and winch,

due to the curved formation of the piston thereof, may be easily mantained against the surface to be chipped This curved device to beflatagainst the curved inner wall of the boiler and easily maintained inposition so that the chipping tool which is operated by the device maybeheld in proper position to perform its functions. On the lower surfaceof the., boiler, the greater portion of the'incrustations are 8%formation of the piston enablesvthe entire,

formed. Due to the heavy construction and curvature of the pistonrodgand the boiler chipping. device, the same w llbe to a great extentmaintained against thls lower surface by gravity and maybe easily showntherein, comprisesa short chipping head33 having a sharp edge '34. Thisparticular type of chipping tool is particularly useful in removingincrustations that are in the form of cakes and are relatively hardwhere the same may'beflchipped' from the shell of the boiler-inrelatively large' por- The chipping tool 7", illustrated in Figs. 7 and8, comprises chipping head 33 which has a more or less curved edge. 341

and this special chipping tool 7 is for the purpose of removingrelatively soft incrustatlons formed upon the lnterior shell. F'I/ areinterchangeable by means of removing the pin 8 and their use dependsuponthe condition of incrustation encountered upon the shell of the boiler.

Having fully 'desc'ribed'a preferred embodiment of this invention, it istobe understood thatit is not intended that the same should be limitedto the exact details of construction herein set forth, but may, obvious-I ly, be varied without departing from the spirit of :the invention asset forth in the appended claims.

'I claim:

1. In a device of the class described, the

combination of a weighted head having a recess formed therein, achipping tool pivotally mounted in the recess, a curved piston mountedat one end in a bore formed in the head in position to engage andactuate the tool, acurved tube secured to the head at one end andenclosing the curved piston, and means secured to the other end of thecurved tube for actuating the piston.

2. In a device of the class described, the combination of a weightedhead, a chipping tool removahly and pivotally mounted Within a recessformed in the; head, a piston rod curved to proximate the interiorcurvature of a boiler, the piston belng mounted at one end in a boreformed in the head to reciprocate the chipping tool, means for limitingthe pivotal movement of the chipping tool, a curved tube secured at oneend to the head and housing the curved piston, and means secured to theother end ofthe curved tube for actuating the piston.

Signed at Famoso, California, this 27 day of June 1925.

FOSTER DOCKSTADER.

